I understood that a Westerly QBO is more associated with extremes of weather- extreme mild or extreme cold, than Easterly QBOs, which, however, tend to give colder weather when averaged. Think 1947, 1979, 1986, 2010.
And if the current, Westerly QBO is record- long, as it appears to be, and there continues to be a strat- trop disconnect, then past about a week, there's ample reason to treat the model output with caution. Were're in uncharted territory.